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http: add support for specifying an SSL cipher list
[git/mjg.git] / http.c
blobc5e94796594de91d494930b9a8047fdb313f973a
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11
12 int active_requests;
13 int http_is_verbose;
14 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
15
16 #if LIBCURL_VERSION_NUM >= 0x070a06
17 #define LIBCURL_CAN_HANDLE_AUTH_ANY
18 #endif
19
20 static int min_curl_sessions = 1;
21 static int curl_session_count;
22 #ifdef USE_CURL_MULTI
23 static int max_requests = -1;
24 static CURLM *curlm;
25 #endif
26 #ifndef NO_CURL_EASY_DUPHANDLE
27 static CURL *curl_default;
28 #endif
29
30 #define PREV_BUF_SIZE 4096
31 #define RANGE_HEADER_SIZE 30
32
33 char curl_errorstr[CURL_ERROR_SIZE];
34
35 static int curl_ssl_verify = -1;
36 static int curl_ssl_try;
37 static const char *ssl_cert;
38 static const char *ssl_cipherlist;
39 #if LIBCURL_VERSION_NUM >= 0x070903
40 static const char *ssl_key;
41 #endif
42 #if LIBCURL_VERSION_NUM >= 0x070908
43 static const char *ssl_capath;
44 #endif
45 static const char *ssl_cainfo;
46 static long curl_low_speed_limit = -1;
47 static long curl_low_speed_time = -1;
48 static int curl_ftp_no_epsv;
49 static const char *curl_http_proxy;
50 static const char *curl_cookie_file;
51 static int curl_save_cookies;
52 struct credential http_auth = CREDENTIAL_INIT;
53 static int http_proactive_auth;
54 static const char *user_agent;
55
56 #if LIBCURL_VERSION_NUM >= 0x071700
57 /* Use CURLOPT_KEYPASSWD as is */
58 #elif LIBCURL_VERSION_NUM >= 0x070903
59 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
60 #else
61 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
62 #endif
63
64 static struct credential cert_auth = CREDENTIAL_INIT;
65 static int ssl_cert_password_required;
66 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
67 static unsigned long http_auth_methods = CURLAUTH_ANY;
68 #endif
69
70 static struct curl_slist *pragma_header;
71 static struct curl_slist *no_pragma_header;
72
73 static struct active_request_slot *active_queue_head;
74
75 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
76 {
77 size_t size = eltsize * nmemb;
78 struct buffer *buffer = buffer_;
79
80 if (size > buffer->buf.len - buffer->posn)
81 size = buffer->buf.len - buffer->posn;
82 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
83 buffer->posn += size;
84
85 return size;
86 }
87
88 #ifndef NO_CURL_IOCTL
89 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
90 {
91 struct buffer *buffer = clientp;
92
93 switch (cmd) {
94 case CURLIOCMD_NOP:
95 return CURLIOE_OK;
96
97 case CURLIOCMD_RESTARTREAD:
98 buffer->posn = 0;
99 return CURLIOE_OK;
100
101 default:
102 return CURLIOE_UNKNOWNCMD;
103 }
104 }
105 #endif
106
107 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
108 {
109 size_t size = eltsize * nmemb;
110 struct strbuf *buffer = buffer_;
111
112 strbuf_add(buffer, ptr, size);
113 return size;
114 }
115
116 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
117 {
118 return eltsize * nmemb;
119 }
120
121 #ifdef USE_CURL_MULTI
122 static void process_curl_messages(void)
123 {
124 int num_messages;
125 struct active_request_slot *slot;
126 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
127
128 while (curl_message != NULL) {
129 if (curl_message->msg == CURLMSG_DONE) {
130 int curl_result = curl_message->data.result;
131 slot = active_queue_head;
132 while (slot != NULL &&
133 slot->curl != curl_message->easy_handle)
134 slot = slot->next;
135 if (slot != NULL) {
136 curl_multi_remove_handle(curlm, slot->curl);
137 slot->curl_result = curl_result;
138 finish_active_slot(slot);
139 } else {
140 fprintf(stderr, "Received DONE message for unknown request!\n");
141 }
142 } else {
143 fprintf(stderr, "Unknown CURL message received: %d\n",
144 (int)curl_message->msg);
145 }
146 curl_message = curl_multi_info_read(curlm, &num_messages);
147 }
148 }
149 #endif
150
151 static int http_options(const char *var, const char *value, void *cb)
152 {
153 if (!strcmp("http.sslverify", var)) {
154 curl_ssl_verify = git_config_bool(var, value);
155 return 0;
156 }
157 if (!strcmp("http.sslcipherlist", var))
158 return git_config_string(&ssl_cipherlist, var, value);
159 if (!strcmp("http.sslcert", var))
160 return git_config_string(&ssl_cert, var, value);
161 #if LIBCURL_VERSION_NUM >= 0x070903
162 if (!strcmp("http.sslkey", var))
163 return git_config_string(&ssl_key, var, value);
164 #endif
165 #if LIBCURL_VERSION_NUM >= 0x070908
166 if (!strcmp("http.sslcapath", var))
167 return git_config_string(&ssl_capath, var, value);
168 #endif
169 if (!strcmp("http.sslcainfo", var))
170 return git_config_string(&ssl_cainfo, var, value);
171 if (!strcmp("http.sslcertpasswordprotected", var)) {
172 ssl_cert_password_required = git_config_bool(var, value);
173 return 0;
174 }
175 if (!strcmp("http.ssltry", var)) {
176 curl_ssl_try = git_config_bool(var, value);
177 return 0;
178 }
179 if (!strcmp("http.minsessions", var)) {
180 min_curl_sessions = git_config_int(var, value);
181 #ifndef USE_CURL_MULTI
182 if (min_curl_sessions > 1)
183 min_curl_sessions = 1;
184 #endif
185 return 0;
186 }
187 #ifdef USE_CURL_MULTI
188 if (!strcmp("http.maxrequests", var)) {
189 max_requests = git_config_int(var, value);
190 return 0;
191 }
192 #endif
193 if (!strcmp("http.lowspeedlimit", var)) {
194 curl_low_speed_limit = (long)git_config_int(var, value);
195 return 0;
196 }
197 if (!strcmp("http.lowspeedtime", var)) {
198 curl_low_speed_time = (long)git_config_int(var, value);
199 return 0;
200 }
201
202 if (!strcmp("http.noepsv", var)) {
203 curl_ftp_no_epsv = git_config_bool(var, value);
204 return 0;
205 }
206 if (!strcmp("http.proxy", var))
207 return git_config_string(&curl_http_proxy, var, value);
208
209 if (!strcmp("http.cookiefile", var))
210 return git_config_string(&curl_cookie_file, var, value);
211 if (!strcmp("http.savecookies", var)) {
212 curl_save_cookies = git_config_bool(var, value);
213 return 0;
214 }
215
216 if (!strcmp("http.postbuffer", var)) {
217 http_post_buffer = git_config_int(var, value);
218 if (http_post_buffer < LARGE_PACKET_MAX)
219 http_post_buffer = LARGE_PACKET_MAX;
220 return 0;
221 }
222
223 if (!strcmp("http.useragent", var))
224 return git_config_string(&user_agent, var, value);
225
226 /* Fall back on the default ones */
227 return git_default_config(var, value, cb);
228 }
229
230 static void init_curl_http_auth(CURL *result)
231 {
232 if (!http_auth.username)
233 return;
234
235 credential_fill(&http_auth);
236
237 #if LIBCURL_VERSION_NUM >= 0x071301
238 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
239 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
240 #else
241 {
242 static struct strbuf up = STRBUF_INIT;
243 /*
244 * Note that we assume we only ever have a single set of
245 * credentials in a given program run, so we do not have
246 * to worry about updating this buffer, only setting its
247 * initial value.
248 */
249 if (!up.len)
250 strbuf_addf(&up, "%s:%s",
251 http_auth.username, http_auth.password);
252 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
253 }
254 #endif
255 }
256
257 static int has_cert_password(void)
258 {
259 if (ssl_cert == NULL || ssl_cert_password_required != 1)
260 return 0;
261 if (!cert_auth.password) {
262 cert_auth.protocol = xstrdup("cert");
263 cert_auth.username = xstrdup("");
264 cert_auth.path = xstrdup(ssl_cert);
265 credential_fill(&cert_auth);
266 }
267 return 1;
268 }
269
270 #if LIBCURL_VERSION_NUM >= 0x071900
271 static void set_curl_keepalive(CURL *c)
272 {
273 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
274 }
275
276 #elif LIBCURL_VERSION_NUM >= 0x071000
277 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
278 {
279 int ka = 1;
280 int rc;
281 socklen_t len = (socklen_t)sizeof(ka);
282
283 if (type != CURLSOCKTYPE_IPCXN)
284 return 0;
285
286 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
287 if (rc < 0)
288 warning("unable to set SO_KEEPALIVE on socket %s",
289 strerror(errno));
290
291 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
292 }
293
294 static void set_curl_keepalive(CURL *c)
295 {
296 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
297 }
298
299 #else
300 static void set_curl_keepalive(CURL *c)
301 {
302 /* not supported on older curl versions */
303 }
304 #endif
305
306 static CURL *get_curl_handle(void)
307 {
308 CURL *result = curl_easy_init();
309
310 if (!result)
311 die("curl_easy_init failed");
312
313 if (!curl_ssl_verify) {
314 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
315 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
316 } else {
317 /* Verify authenticity of the peer's certificate */
318 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
319 /* The name in the cert must match whom we tried to connect */
320 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
321 }
322
323 #if LIBCURL_VERSION_NUM >= 0x070907
324 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
325 #endif
326 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
327 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
328 #endif
329
330 if (http_proactive_auth)
331 init_curl_http_auth(result);
332
333 if (getenv("GIT_SSL_CIPHER_LIST"))
334 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
335
336 if (ssl_cipherlist != NULL && *ssl_cipherlist)
337 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
338 ssl_cipherlist);
339
340 if (ssl_cert != NULL)
341 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
342 if (has_cert_password())
343 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
344 #if LIBCURL_VERSION_NUM >= 0x070903
345 if (ssl_key != NULL)
346 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
347 #endif
348 #if LIBCURL_VERSION_NUM >= 0x070908
349 if (ssl_capath != NULL)
350 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
351 #endif
352 if (ssl_cainfo != NULL)
353 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
354
355 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
356 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
357 curl_low_speed_limit);
358 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
359 curl_low_speed_time);
360 }
361
362 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
363 #if LIBCURL_VERSION_NUM >= 0x071301
364 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
365 #elif LIBCURL_VERSION_NUM >= 0x071101
366 curl_easy_setopt(result, CURLOPT_POST301, 1);
367 #endif
368
369 if (getenv("GIT_CURL_VERBOSE"))
370 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
371
372 curl_easy_setopt(result, CURLOPT_USERAGENT,
373 user_agent ? user_agent : git_user_agent());
374
375 if (curl_ftp_no_epsv)
376 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
377
378 #ifdef CURLOPT_USE_SSL
379 if (curl_ssl_try)
380 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
381 #endif
382
383 if (curl_http_proxy) {
384 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
385 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
386 }
387
388 set_curl_keepalive(result);
389
390 return result;
391 }
392
393 static void set_from_env(const char **var, const char *envname)
394 {
395 const char *val = getenv(envname);
396 if (val)
397 *var = val;
398 }
399
400 void http_init(struct remote *remote, const char *url, int proactive_auth)
401 {
402 char *low_speed_limit;
403 char *low_speed_time;
404 char *normalized_url;
405 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
406
407 config.section = "http";
408 config.key = NULL;
409 config.collect_fn = http_options;
410 config.cascade_fn = git_default_config;
411 config.cb = NULL;
412
413 http_is_verbose = 0;
414 normalized_url = url_normalize(url, &config.url);
415
416 git_config(urlmatch_config_entry, &config);
417 free(normalized_url);
418
419 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
420 die("curl_global_init failed");
421
422 http_proactive_auth = proactive_auth;
423
424 if (remote && remote->http_proxy)
425 curl_http_proxy = xstrdup(remote->http_proxy);
426
427 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
428 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
429
430 #ifdef USE_CURL_MULTI
431 {
432 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
433 if (http_max_requests != NULL)
434 max_requests = atoi(http_max_requests);
435 }
436
437 curlm = curl_multi_init();
438 if (!curlm)
439 die("curl_multi_init failed");
440 #endif
441
442 if (getenv("GIT_SSL_NO_VERIFY"))
443 curl_ssl_verify = 0;
444
445 set_from_env(&ssl_cert, "GIT_SSL_CERT");
446 #if LIBCURL_VERSION_NUM >= 0x070903
447 set_from_env(&ssl_key, "GIT_SSL_KEY");
448 #endif
449 #if LIBCURL_VERSION_NUM >= 0x070908
450 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
451 #endif
452 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
453
454 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
455
456 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
457 if (low_speed_limit != NULL)
458 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
459 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
460 if (low_speed_time != NULL)
461 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
462
463 if (curl_ssl_verify == -1)
464 curl_ssl_verify = 1;
465
466 curl_session_count = 0;
467 #ifdef USE_CURL_MULTI
468 if (max_requests < 1)
469 max_requests = DEFAULT_MAX_REQUESTS;
470 #endif
471
472 if (getenv("GIT_CURL_FTP_NO_EPSV"))
473 curl_ftp_no_epsv = 1;
474
475 if (url) {
476 credential_from_url(&http_auth, url);
477 if (!ssl_cert_password_required &&
478 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
479 starts_with(url, "https://"))
480 ssl_cert_password_required = 1;
481 }
482
483 #ifndef NO_CURL_EASY_DUPHANDLE
484 curl_default = get_curl_handle();
485 #endif
486 }
487
488 void http_cleanup(void)
489 {
490 struct active_request_slot *slot = active_queue_head;
491
492 while (slot != NULL) {
493 struct active_request_slot *next = slot->next;
494 if (slot->curl != NULL) {
495 #ifdef USE_CURL_MULTI
496 curl_multi_remove_handle(curlm, slot->curl);
497 #endif
498 curl_easy_cleanup(slot->curl);
499 }
500 free(slot);
501 slot = next;
502 }
503 active_queue_head = NULL;
504
505 #ifndef NO_CURL_EASY_DUPHANDLE
506 curl_easy_cleanup(curl_default);
507 #endif
508
509 #ifdef USE_CURL_MULTI
510 curl_multi_cleanup(curlm);
511 #endif
512 curl_global_cleanup();
513
514 curl_slist_free_all(pragma_header);
515 pragma_header = NULL;
516
517 curl_slist_free_all(no_pragma_header);
518 no_pragma_header = NULL;
519
520 if (curl_http_proxy) {
521 free((void *)curl_http_proxy);
522 curl_http_proxy = NULL;
523 }
524
525 if (cert_auth.password != NULL) {
526 memset(cert_auth.password, 0, strlen(cert_auth.password));
527 free(cert_auth.password);
528 cert_auth.password = NULL;
529 }
530 ssl_cert_password_required = 0;
531 }
532
533 struct active_request_slot *get_active_slot(void)
534 {
535 struct active_request_slot *slot = active_queue_head;
536 struct active_request_slot *newslot;
537
538 #ifdef USE_CURL_MULTI
539 int num_transfers;
540
541 /* Wait for a slot to open up if the queue is full */
542 while (active_requests >= max_requests) {
543 curl_multi_perform(curlm, &num_transfers);
544 if (num_transfers < active_requests)
545 process_curl_messages();
546 }
547 #endif
548
549 while (slot != NULL && slot->in_use)
550 slot = slot->next;
551
552 if (slot == NULL) {
553 newslot = xmalloc(sizeof(*newslot));
554 newslot->curl = NULL;
555 newslot->in_use = 0;
556 newslot->next = NULL;
557
558 slot = active_queue_head;
559 if (slot == NULL) {
560 active_queue_head = newslot;
561 } else {
562 while (slot->next != NULL)
563 slot = slot->next;
564 slot->next = newslot;
565 }
566 slot = newslot;
567 }
568
569 if (slot->curl == NULL) {
570 #ifdef NO_CURL_EASY_DUPHANDLE
571 slot->curl = get_curl_handle();
572 #else
573 slot->curl = curl_easy_duphandle(curl_default);
574 #endif
575 curl_session_count++;
576 }
577
578 active_requests++;
579 slot->in_use = 1;
580 slot->results = NULL;
581 slot->finished = NULL;
582 slot->callback_data = NULL;
583 slot->callback_func = NULL;
584 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
585 if (curl_save_cookies)
586 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
587 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
588 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
589 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
590 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
591 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
592 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
593 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
594 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
595 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
596 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
597 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
598 #endif
599 if (http_auth.password)
600 init_curl_http_auth(slot->curl);
601
602 return slot;
603 }
604
605 int start_active_slot(struct active_request_slot *slot)
606 {
607 #ifdef USE_CURL_MULTI
608 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
609 int num_transfers;
610
611 if (curlm_result != CURLM_OK &&
612 curlm_result != CURLM_CALL_MULTI_PERFORM) {
613 active_requests--;
614 slot->in_use = 0;
615 return 0;
616 }
617
618 /*
619 * We know there must be something to do, since we just added
620 * something.
621 */
622 curl_multi_perform(curlm, &num_transfers);
623 #endif
624 return 1;
625 }
626
627 #ifdef USE_CURL_MULTI
628 struct fill_chain {
629 void *data;
630 int (*fill)(void *);
631 struct fill_chain *next;
632 };
633
634 static struct fill_chain *fill_cfg;
635
636 void add_fill_function(void *data, int (*fill)(void *))
637 {
638 struct fill_chain *new = xmalloc(sizeof(*new));
639 struct fill_chain **linkp = &fill_cfg;
640 new->data = data;
641 new->fill = fill;
642 new->next = NULL;
643 while (*linkp)
644 linkp = &(*linkp)->next;
645 *linkp = new;
646 }
647
648 void fill_active_slots(void)
649 {
650 struct active_request_slot *slot = active_queue_head;
651
652 while (active_requests < max_requests) {
653 struct fill_chain *fill;
654 for (fill = fill_cfg; fill; fill = fill->next)
655 if (fill->fill(fill->data))
656 break;
657
658 if (!fill)
659 break;
660 }
661
662 while (slot != NULL) {
663 if (!slot->in_use && slot->curl != NULL
664 && curl_session_count > min_curl_sessions) {
665 curl_easy_cleanup(slot->curl);
666 slot->curl = NULL;
667 curl_session_count--;
668 }
669 slot = slot->next;
670 }
671 }
672
673 void step_active_slots(void)
674 {
675 int num_transfers;
676 CURLMcode curlm_result;
677
678 do {
679 curlm_result = curl_multi_perform(curlm, &num_transfers);
680 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
681 if (num_transfers < active_requests) {
682 process_curl_messages();
683 fill_active_slots();
684 }
685 }
686 #endif
687
688 void run_active_slot(struct active_request_slot *slot)
689 {
690 #ifdef USE_CURL_MULTI
691 fd_set readfds;
692 fd_set writefds;
693 fd_set excfds;
694 int max_fd;
695 struct timeval select_timeout;
696 int finished = 0;
697
698 slot->finished = &finished;
699 while (!finished) {
700 step_active_slots();
701
702 if (slot->in_use) {
703 #if LIBCURL_VERSION_NUM >= 0x070f04
704 long curl_timeout;
705 curl_multi_timeout(curlm, &curl_timeout);
706 if (curl_timeout == 0) {
707 continue;
708 } else if (curl_timeout == -1) {
709 select_timeout.tv_sec = 0;
710 select_timeout.tv_usec = 50000;
711 } else {
712 select_timeout.tv_sec = curl_timeout / 1000;
713 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
714 }
715 #else
716 select_timeout.tv_sec = 0;
717 select_timeout.tv_usec = 50000;
718 #endif
719
720 max_fd = -1;
721 FD_ZERO(&readfds);
722 FD_ZERO(&writefds);
723 FD_ZERO(&excfds);
724 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
725
726 /*
727 * It can happen that curl_multi_timeout returns a pathologically
728 * long timeout when curl_multi_fdset returns no file descriptors
729 * to read. See commit message for more details.
730 */
731 if (max_fd < 0 &&
732 (select_timeout.tv_sec > 0 ||
733 select_timeout.tv_usec > 50000)) {
734 select_timeout.tv_sec = 0;
735 select_timeout.tv_usec = 50000;
736 }
737
738 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
739 }
740 }
741 #else
742 while (slot->in_use) {
743 slot->curl_result = curl_easy_perform(slot->curl);
744 finish_active_slot(slot);
745 }
746 #endif
747 }
748
749 static void closedown_active_slot(struct active_request_slot *slot)
750 {
751 active_requests--;
752 slot->in_use = 0;
753 }
754
755 static void release_active_slot(struct active_request_slot *slot)
756 {
757 closedown_active_slot(slot);
758 if (slot->curl && curl_session_count > min_curl_sessions) {
759 #ifdef USE_CURL_MULTI
760 curl_multi_remove_handle(curlm, slot->curl);
761 #endif
762 curl_easy_cleanup(slot->curl);
763 slot->curl = NULL;
764 curl_session_count--;
765 }
766 #ifdef USE_CURL_MULTI
767 fill_active_slots();
768 #endif
769 }
770
771 void finish_active_slot(struct active_request_slot *slot)
772 {
773 closedown_active_slot(slot);
774 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
775
776 if (slot->finished != NULL)
777 (*slot->finished) = 1;
778
779 /* Store slot results so they can be read after the slot is reused */
780 if (slot->results != NULL) {
781 slot->results->curl_result = slot->curl_result;
782 slot->results->http_code = slot->http_code;
783 #if LIBCURL_VERSION_NUM >= 0x070a08
784 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
785 &slot->results->auth_avail);
786 #else
787 slot->results->auth_avail = 0;
788 #endif
789 }
790
791 /* Run callback if appropriate */
792 if (slot->callback_func != NULL)
793 slot->callback_func(slot->callback_data);
794 }
795
796 void finish_all_active_slots(void)
797 {
798 struct active_request_slot *slot = active_queue_head;
799
800 while (slot != NULL)
801 if (slot->in_use) {
802 run_active_slot(slot);
803 slot = active_queue_head;
804 } else {
805 slot = slot->next;
806 }
807 }
808
809 /* Helpers for modifying and creating URLs */
810 static inline int needs_quote(int ch)
811 {
812 if (((ch >= 'A') && (ch <= 'Z'))
813 || ((ch >= 'a') && (ch <= 'z'))
814 || ((ch >= '0') && (ch <= '9'))
815 || (ch == '/')
816 || (ch == '-')
817 || (ch == '.'))
818 return 0;
819 return 1;
820 }
821
822 static char *quote_ref_url(const char *base, const char *ref)
823 {
824 struct strbuf buf = STRBUF_INIT;
825 const char *cp;
826 int ch;
827
828 end_url_with_slash(&buf, base);
829
830 for (cp = ref; (ch = *cp) != 0; cp++)
831 if (needs_quote(ch))
832 strbuf_addf(&buf, "%%%02x", ch);
833 else
834 strbuf_addch(&buf, *cp);
835
836 return strbuf_detach(&buf, NULL);
837 }
838
839 void append_remote_object_url(struct strbuf *buf, const char *url,
840 const char *hex,
841 int only_two_digit_prefix)
842 {
843 end_url_with_slash(buf, url);
844
845 strbuf_addf(buf, "objects/%.*s/", 2, hex);
846 if (!only_two_digit_prefix)
847 strbuf_addf(buf, "%s", hex+2);
848 }
849
850 char *get_remote_object_url(const char *url, const char *hex,
851 int only_two_digit_prefix)
852 {
853 struct strbuf buf = STRBUF_INIT;
854 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
855 return strbuf_detach(&buf, NULL);
856 }
857
858 int handle_curl_result(struct slot_results *results)
859 {
860 /*
861 * If we see a failing http code with CURLE_OK, we have turned off
862 * FAILONERROR (to keep the server's custom error response), and should
863 * translate the code into failure here.
864 */
865 if (results->curl_result == CURLE_OK &&
866 results->http_code >= 400) {
867 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
868 /*
869 * Normally curl will already have put the "reason phrase"
870 * from the server into curl_errorstr; unfortunately without
871 * FAILONERROR it is lost, so we can give only the numeric
872 * status code.
873 */
874 snprintf(curl_errorstr, sizeof(curl_errorstr),
875 "The requested URL returned error: %ld",
876 results->http_code);
877 }
878
879 if (results->curl_result == CURLE_OK) {
880 credential_approve(&http_auth);
881 return HTTP_OK;
882 } else if (missing_target(results))
883 return HTTP_MISSING_TARGET;
884 else if (results->http_code == 401) {
885 if (http_auth.username && http_auth.password) {
886 credential_reject(&http_auth);
887 return HTTP_NOAUTH;
888 } else {
889 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
890 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
891 #endif
892 return HTTP_REAUTH;
893 }
894 } else {
895 #if LIBCURL_VERSION_NUM >= 0x070c00
896 if (!curl_errorstr[0])
897 strlcpy(curl_errorstr,
898 curl_easy_strerror(results->curl_result),
899 sizeof(curl_errorstr));
900 #endif
901 return HTTP_ERROR;
902 }
903 }
904
905 int run_one_slot(struct active_request_slot *slot,
906 struct slot_results *results)
907 {
908 slot->results = results;
909 if (!start_active_slot(slot)) {
910 snprintf(curl_errorstr, sizeof(curl_errorstr),
911 "failed to start HTTP request");
912 return HTTP_START_FAILED;
913 }
914
915 run_active_slot(slot);
916 return handle_curl_result(results);
917 }
918
919 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
920 {
921 char *ptr;
922 CURLcode ret;
923
924 strbuf_reset(buf);
925 ret = curl_easy_getinfo(curl, info, &ptr);
926 if (!ret && ptr)
927 strbuf_addstr(buf, ptr);
928 return ret;
929 }
930
931 /*
932 * Check for and extract a content-type parameter. "raw"
933 * should be positioned at the start of the potential
934 * parameter, with any whitespace already removed.
935 *
936 * "name" is the name of the parameter. The value is appended
937 * to "out".
938 */
939 static int extract_param(const char *raw, const char *name,
940 struct strbuf *out)
941 {
942 size_t len = strlen(name);
943
944 if (strncasecmp(raw, name, len))
945 return -1;
946 raw += len;
947
948 if (*raw != '=')
949 return -1;
950 raw++;
951
952 while (*raw && !isspace(*raw) && *raw != ';')
953 strbuf_addch(out, *raw++);
954 return 0;
955 }
956
957 /*
958 * Extract a normalized version of the content type, with any
959 * spaces suppressed, all letters lowercased, and no trailing ";"
960 * or parameters.
961 *
962 * Note that we will silently remove even invalid whitespace. For
963 * example, "text / plain" is specifically forbidden by RFC 2616,
964 * but "text/plain" is the only reasonable output, and this keeps
965 * our code simple.
966 *
967 * If the "charset" argument is not NULL, store the value of any
968 * charset parameter there.
969 *
970 * Example:
971 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
972 * "text / plain" -> "text/plain"
973 */
974 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
975 struct strbuf *charset)
976 {
977 const char *p;
978
979 strbuf_reset(type);
980 strbuf_grow(type, raw->len);
981 for (p = raw->buf; *p; p++) {
982 if (isspace(*p))
983 continue;
984 if (*p == ';') {
985 p++;
986 break;
987 }
988 strbuf_addch(type, tolower(*p));
989 }
990
991 if (!charset)
992 return;
993
994 strbuf_reset(charset);
995 while (*p) {
996 while (isspace(*p) || *p == ';')
997 p++;
998 if (!extract_param(p, "charset", charset))
999 return;
1000 while (*p && !isspace(*p))
1001 p++;
1002 }
1003
1004 if (!charset->len && starts_with(type->buf, "text/"))
1005 strbuf_addstr(charset, "ISO-8859-1");
1006 }
1007
1008
1009 /* http_request() targets */
1010 #define HTTP_REQUEST_STRBUF 0
1011 #define HTTP_REQUEST_FILE 1
1012
1013 static int http_request(const char *url,
1014 void *result, int target,
1015 const struct http_get_options *options)
1016 {
1017 struct active_request_slot *slot;
1018 struct slot_results results;
1019 struct curl_slist *headers = NULL;
1020 struct strbuf buf = STRBUF_INIT;
1021 int ret;
1022
1023 slot = get_active_slot();
1024 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1025
1026 if (result == NULL) {
1027 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1028 } else {
1029 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1030 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1031
1032 if (target == HTTP_REQUEST_FILE) {
1033 long posn = ftell(result);
1034 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1035 fwrite);
1036 if (posn > 0) {
1037 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1038 headers = curl_slist_append(headers, buf.buf);
1039 strbuf_reset(&buf);
1040 }
1041 } else
1042 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1043 fwrite_buffer);
1044 }
1045
1046 strbuf_addstr(&buf, "Pragma:");
1047 if (options && options->no_cache)
1048 strbuf_addstr(&buf, " no-cache");
1049 if (options && options->keep_error)
1050 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1051
1052 headers = curl_slist_append(headers, buf.buf);
1053
1054 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1055 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1056 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1057
1058 ret = run_one_slot(slot, &results);
1059
1060 if (options && options->content_type) {
1061 struct strbuf raw = STRBUF_INIT;
1062 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1063 extract_content_type(&raw, options->content_type,
1064 options->charset);
1065 strbuf_release(&raw);
1066 }
1067
1068 if (options && options->effective_url)
1069 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1070 options->effective_url);
1071
1072 curl_slist_free_all(headers);
1073 strbuf_release(&buf);
1074
1075 return ret;
1076 }
1077
1078 /*
1079 * Update the "base" url to a more appropriate value, as deduced by
1080 * redirects seen when requesting a URL starting with "url".
1081 *
1082 * The "asked" parameter is a URL that we asked curl to access, and must begin
1083 * with "base".
1084 *
1085 * The "got" parameter is the URL that curl reported to us as where we ended
1086 * up.
1087 *
1088 * Returns 1 if we updated the base url, 0 otherwise.
1089 *
1090 * Our basic strategy is to compare "base" and "asked" to find the bits
1091 * specific to our request. We then strip those bits off of "got" to yield the
1092 * new base. So for example, if our base is "http://example.com/foo.git",
1093 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1094 * with "https://other.example.com/foo.git/info/refs". We would want the
1095 * new URL to become "https://other.example.com/foo.git".
1096 *
1097 * Note that this assumes a sane redirect scheme. It's entirely possible
1098 * in the example above to end up at a URL that does not even end in
1099 * "info/refs". In such a case we simply punt, as there is not much we can
1100 * do (and such a scheme is unlikely to represent a real git repository,
1101 * which means we are likely about to abort anyway).
1102 */
1103 static int update_url_from_redirect(struct strbuf *base,
1104 const char *asked,
1105 const struct strbuf *got)
1106 {
1107 const char *tail;
1108 size_t tail_len;
1109
1110 if (!strcmp(asked, got->buf))
1111 return 0;
1112
1113 if (!skip_prefix(asked, base->buf, &tail))
1114 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1115 asked, base->buf);
1116
1117 tail_len = strlen(tail);
1118
1119 if (got->len < tail_len ||
1120 strcmp(tail, got->buf + got->len - tail_len))
1121 return 0; /* insane redirect scheme */
1122
1123 strbuf_reset(base);
1124 strbuf_add(base, got->buf, got->len - tail_len);
1125 return 1;
1126 }
1127
1128 static int http_request_reauth(const char *url,
1129 void *result, int target,
1130 struct http_get_options *options)
1131 {
1132 int ret = http_request(url, result, target, options);
1133
1134 if (options && options->effective_url && options->base_url) {
1135 if (update_url_from_redirect(options->base_url,
1136 url, options->effective_url)) {
1137 credential_from_url(&http_auth, options->base_url->buf);
1138 url = options->effective_url->buf;
1139 }
1140 }
1141
1142 if (ret != HTTP_REAUTH)
1143 return ret;
1144
1145 /*
1146 * If we are using KEEP_ERROR, the previous request may have
1147 * put cruft into our output stream; we should clear it out before
1148 * making our next request. We only know how to do this for
1149 * the strbuf case, but that is enough to satisfy current callers.
1150 */
1151 if (options && options->keep_error) {
1152 switch (target) {
1153 case HTTP_REQUEST_STRBUF:
1154 strbuf_reset(result);
1155 break;
1156 default:
1157 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1158 }
1159 }
1160
1161 credential_fill(&http_auth);
1162
1163 return http_request(url, result, target, options);
1164 }
1165
1166 int http_get_strbuf(const char *url,
1167 struct strbuf *result,
1168 struct http_get_options *options)
1169 {
1170 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1171 }
1172
1173 /*
1174 * Downloads a URL and stores the result in the given file.
1175 *
1176 * If a previous interrupted download is detected (i.e. a previous temporary
1177 * file is still around) the download is resumed.
1178 */
1179 static int http_get_file(const char *url, const char *filename,
1180 struct http_get_options *options)
1181 {
1182 int ret;
1183 struct strbuf tmpfile = STRBUF_INIT;
1184 FILE *result;
1185
1186 strbuf_addf(&tmpfile, "%s.temp", filename);
1187 result = fopen(tmpfile.buf, "a");
1188 if (!result) {
1189 error("Unable to open local file %s", tmpfile.buf);
1190 ret = HTTP_ERROR;
1191 goto cleanup;
1192 }
1193
1194 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1195 fclose(result);
1196
1197 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1198 ret = HTTP_ERROR;
1199 cleanup:
1200 strbuf_release(&tmpfile);
1201 return ret;
1202 }
1203
1204 int http_fetch_ref(const char *base, struct ref *ref)
1205 {
1206 struct http_get_options options = {0};
1207 char *url;
1208 struct strbuf buffer = STRBUF_INIT;
1209 int ret = -1;
1210
1211 options.no_cache = 1;
1212
1213 url = quote_ref_url(base, ref->name);
1214 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1215 strbuf_rtrim(&buffer);
1216 if (buffer.len == 40)
1217 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1218 else if (starts_with(buffer.buf, "ref: ")) {
1219 ref->symref = xstrdup(buffer.buf + 5);
1220 ret = 0;
1221 }
1222 }
1223
1224 strbuf_release(&buffer);
1225 free(url);
1226 return ret;
1227 }
1228
1229 /* Helpers for fetching packs */
1230 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1231 {
1232 char *url, *tmp;
1233 struct strbuf buf = STRBUF_INIT;
1234
1235 if (http_is_verbose)
1236 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1237
1238 end_url_with_slash(&buf, base_url);
1239 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1240 url = strbuf_detach(&buf, NULL);
1241
1242 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1243 tmp = strbuf_detach(&buf, NULL);
1244
1245 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1246 error("Unable to get pack index %s", url);
1247 free(tmp);
1248 tmp = NULL;
1249 }
1250
1251 free(url);
1252 return tmp;
1253 }
1254
1255 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1256 unsigned char *sha1, const char *base_url)
1257 {
1258 struct packed_git *new_pack;
1259 char *tmp_idx = NULL;
1260 int ret;
1261
1262 if (has_pack_index(sha1)) {
1263 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1264 if (!new_pack)
1265 return -1; /* parse_pack_index() already issued error message */
1266 goto add_pack;
1267 }
1268
1269 tmp_idx = fetch_pack_index(sha1, base_url);
1270 if (!tmp_idx)
1271 return -1;
1272
1273 new_pack = parse_pack_index(sha1, tmp_idx);
1274 if (!new_pack) {
1275 unlink(tmp_idx);
1276 free(tmp_idx);
1277
1278 return -1; /* parse_pack_index() already issued error message */
1279 }
1280
1281 ret = verify_pack_index(new_pack);
1282 if (!ret) {
1283 close_pack_index(new_pack);
1284 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1285 }
1286 free(tmp_idx);
1287 if (ret)
1288 return -1;
1289
1290 add_pack:
1291 new_pack->next = *packs_head;
1292 *packs_head = new_pack;
1293 return 0;
1294 }
1295
1296 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1297 {
1298 struct http_get_options options = {0};
1299 int ret = 0, i = 0;
1300 char *url, *data;
1301 struct strbuf buf = STRBUF_INIT;
1302 unsigned char sha1[20];
1303
1304 end_url_with_slash(&buf, base_url);
1305 strbuf_addstr(&buf, "objects/info/packs");
1306 url = strbuf_detach(&buf, NULL);
1307
1308 options.no_cache = 1;
1309 ret = http_get_strbuf(url, &buf, &options);
1310 if (ret != HTTP_OK)
1311 goto cleanup;
1312
1313 data = buf.buf;
1314 while (i < buf.len) {
1315 switch (data[i]) {
1316 case 'P':
1317 i++;
1318 if (i + 52 <= buf.len &&
1319 starts_with(data + i, " pack-") &&
1320 starts_with(data + i + 46, ".pack\n")) {
1321 get_sha1_hex(data + i + 6, sha1);
1322 fetch_and_setup_pack_index(packs_head, sha1,
1323 base_url);
1324 i += 51;
1325 break;
1326 }
1327 default:
1328 while (i < buf.len && data[i] != '\n')
1329 i++;
1330 }
1331 i++;
1332 }
1333
1334 cleanup:
1335 free(url);
1336 return ret;
1337 }
1338
1339 void release_http_pack_request(struct http_pack_request *preq)
1340 {
1341 if (preq->packfile != NULL) {
1342 fclose(preq->packfile);
1343 preq->packfile = NULL;
1344 }
1345 if (preq->range_header != NULL) {
1346 curl_slist_free_all(preq->range_header);
1347 preq->range_header = NULL;
1348 }
1349 preq->slot = NULL;
1350 free(preq->url);
1351 }
1352
1353 int finish_http_pack_request(struct http_pack_request *preq)
1354 {
1355 struct packed_git **lst;
1356 struct packed_git *p = preq->target;
1357 char *tmp_idx;
1358 struct child_process ip = CHILD_PROCESS_INIT;
1359 const char *ip_argv[8];
1360
1361 close_pack_index(p);
1362
1363 fclose(preq->packfile);
1364 preq->packfile = NULL;
1365
1366 lst = preq->lst;
1367 while (*lst != p)
1368 lst = &((*lst)->next);
1369 *lst = (*lst)->next;
1370
1371 tmp_idx = xstrdup(preq->tmpfile);
1372 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1373 ".idx.temp");
1374
1375 ip_argv[0] = "index-pack";
1376 ip_argv[1] = "-o";
1377 ip_argv[2] = tmp_idx;
1378 ip_argv[3] = preq->tmpfile;
1379 ip_argv[4] = NULL;
1380
1381 ip.argv = ip_argv;
1382 ip.git_cmd = 1;
1383 ip.no_stdin = 1;
1384 ip.no_stdout = 1;
1385
1386 if (run_command(&ip)) {
1387 unlink(preq->tmpfile);
1388 unlink(tmp_idx);
1389 free(tmp_idx);
1390 return -1;
1391 }
1392
1393 unlink(sha1_pack_index_name(p->sha1));
1394
1395 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1396 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1397 free(tmp_idx);
1398 return -1;
1399 }
1400
1401 install_packed_git(p);
1402 free(tmp_idx);
1403 return 0;
1404 }
1405
1406 struct http_pack_request *new_http_pack_request(
1407 struct packed_git *target, const char *base_url)
1408 {
1409 long prev_posn = 0;
1410 char range[RANGE_HEADER_SIZE];
1411 struct strbuf buf = STRBUF_INIT;
1412 struct http_pack_request *preq;
1413
1414 preq = xcalloc(1, sizeof(*preq));
1415 preq->target = target;
1416
1417 end_url_with_slash(&buf, base_url);
1418 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1419 sha1_to_hex(target->sha1));
1420 preq->url = strbuf_detach(&buf, NULL);
1421
1422 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1423 sha1_pack_name(target->sha1));
1424 preq->packfile = fopen(preq->tmpfile, "a");
1425 if (!preq->packfile) {
1426 error("Unable to open local file %s for pack",
1427 preq->tmpfile);
1428 goto abort;
1429 }
1430
1431 preq->slot = get_active_slot();
1432 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1433 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1434 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1435 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1436 no_pragma_header);
1437
1438 /*
1439 * If there is data present from a previous transfer attempt,
1440 * resume where it left off
1441 */
1442 prev_posn = ftell(preq->packfile);
1443 if (prev_posn>0) {
1444 if (http_is_verbose)
1445 fprintf(stderr,
1446 "Resuming fetch of pack %s at byte %ld\n",
1447 sha1_to_hex(target->sha1), prev_posn);
1448 sprintf(range, "Range: bytes=%ld-", prev_posn);
1449 preq->range_header = curl_slist_append(NULL, range);
1450 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1451 preq->range_header);
1452 }
1453
1454 return preq;
1455
1456 abort:
1457 free(preq->url);
1458 free(preq);
1459 return NULL;
1460 }
1461
1462 /* Helpers for fetching objects (loose) */
1463 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1464 void *data)
1465 {
1466 unsigned char expn[4096];
1467 size_t size = eltsize * nmemb;
1468 int posn = 0;
1469 struct http_object_request *freq =
1470 (struct http_object_request *)data;
1471 do {
1472 ssize_t retval = xwrite(freq->localfile,
1473 (char *) ptr + posn, size - posn);
1474 if (retval < 0)
1475 return posn;
1476 posn += retval;
1477 } while (posn < size);
1478
1479 freq->stream.avail_in = size;
1480 freq->stream.next_in = (void *)ptr;
1481 do {
1482 freq->stream.next_out = expn;
1483 freq->stream.avail_out = sizeof(expn);
1484 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1485 git_SHA1_Update(&freq->c, expn,
1486 sizeof(expn) - freq->stream.avail_out);
1487 } while (freq->stream.avail_in && freq->zret == Z_OK);
1488 return size;
1489 }
1490
1491 struct http_object_request *new_http_object_request(const char *base_url,
1492 unsigned char *sha1)
1493 {
1494 char *hex = sha1_to_hex(sha1);
1495 const char *filename;
1496 char prevfile[PATH_MAX];
1497 int prevlocal;
1498 char prev_buf[PREV_BUF_SIZE];
1499 ssize_t prev_read = 0;
1500 long prev_posn = 0;
1501 char range[RANGE_HEADER_SIZE];
1502 struct curl_slist *range_header = NULL;
1503 struct http_object_request *freq;
1504
1505 freq = xcalloc(1, sizeof(*freq));
1506 hashcpy(freq->sha1, sha1);
1507 freq->localfile = -1;
1508
1509 filename = sha1_file_name(sha1);
1510 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1511 "%s.temp", filename);
1512
1513 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1514 unlink_or_warn(prevfile);
1515 rename(freq->tmpfile, prevfile);
1516 unlink_or_warn(freq->tmpfile);
1517
1518 if (freq->localfile != -1)
1519 error("fd leakage in start: %d", freq->localfile);
1520 freq->localfile = open(freq->tmpfile,
1521 O_WRONLY | O_CREAT | O_EXCL, 0666);
1522 /*
1523 * This could have failed due to the "lazy directory creation";
1524 * try to mkdir the last path component.
1525 */
1526 if (freq->localfile < 0 && errno == ENOENT) {
1527 char *dir = strrchr(freq->tmpfile, '/');
1528 if (dir) {
1529 *dir = 0;
1530 mkdir(freq->tmpfile, 0777);
1531 *dir = '/';
1532 }
1533 freq->localfile = open(freq->tmpfile,
1534 O_WRONLY | O_CREAT | O_EXCL, 0666);
1535 }
1536
1537 if (freq->localfile < 0) {
1538 error("Couldn't create temporary file %s: %s",
1539 freq->tmpfile, strerror(errno));
1540 goto abort;
1541 }
1542
1543 git_inflate_init(&freq->stream);
1544
1545 git_SHA1_Init(&freq->c);
1546
1547 freq->url = get_remote_object_url(base_url, hex, 0);
1548
1549 /*
1550 * If a previous temp file is present, process what was already
1551 * fetched.
1552 */
1553 prevlocal = open(prevfile, O_RDONLY);
1554 if (prevlocal != -1) {
1555 do {
1556 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1557 if (prev_read>0) {
1558 if (fwrite_sha1_file(prev_buf,
1559 1,
1560 prev_read,
1561 freq) == prev_read) {
1562 prev_posn += prev_read;
1563 } else {
1564 prev_read = -1;
1565 }
1566 }
1567 } while (prev_read > 0);
1568 close(prevlocal);
1569 }
1570 unlink_or_warn(prevfile);
1571
1572 /*
1573 * Reset inflate/SHA1 if there was an error reading the previous temp
1574 * file; also rewind to the beginning of the local file.
1575 */
1576 if (prev_read == -1) {
1577 memset(&freq->stream, 0, sizeof(freq->stream));
1578 git_inflate_init(&freq->stream);
1579 git_SHA1_Init(&freq->c);
1580 if (prev_posn>0) {
1581 prev_posn = 0;
1582 lseek(freq->localfile, 0, SEEK_SET);
1583 if (ftruncate(freq->localfile, 0) < 0) {
1584 error("Couldn't truncate temporary file %s: %s",
1585 freq->tmpfile, strerror(errno));
1586 goto abort;
1587 }
1588 }
1589 }
1590
1591 freq->slot = get_active_slot();
1592
1593 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1594 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1595 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1596 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1597 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1598
1599 /*
1600 * If we have successfully processed data from a previous fetch
1601 * attempt, only fetch the data we don't already have.
1602 */
1603 if (prev_posn>0) {
1604 if (http_is_verbose)
1605 fprintf(stderr,
1606 "Resuming fetch of object %s at byte %ld\n",
1607 hex, prev_posn);
1608 sprintf(range, "Range: bytes=%ld-", prev_posn);
1609 range_header = curl_slist_append(range_header, range);
1610 curl_easy_setopt(freq->slot->curl,
1611 CURLOPT_HTTPHEADER, range_header);
1612 }
1613
1614 return freq;
1615
1616 abort:
1617 free(freq->url);
1618 free(freq);
1619 return NULL;
1620 }
1621
1622 void process_http_object_request(struct http_object_request *freq)
1623 {
1624 if (freq->slot == NULL)
1625 return;
1626 freq->curl_result = freq->slot->curl_result;
1627 freq->http_code = freq->slot->http_code;
1628 freq->slot = NULL;
1629 }
1630
1631 int finish_http_object_request(struct http_object_request *freq)
1632 {
1633 struct stat st;
1634
1635 close(freq->localfile);
1636 freq->localfile = -1;
1637
1638 process_http_object_request(freq);
1639
1640 if (freq->http_code == 416) {
1641 warning("requested range invalid; we may already have all the data.");
1642 } else if (freq->curl_result != CURLE_OK) {
1643 if (stat(freq->tmpfile, &st) == 0)
1644 if (st.st_size == 0)
1645 unlink_or_warn(freq->tmpfile);
1646 return -1;
1647 }
1648
1649 git_inflate_end(&freq->stream);
1650 git_SHA1_Final(freq->real_sha1, &freq->c);
1651 if (freq->zret != Z_STREAM_END) {
1652 unlink_or_warn(freq->tmpfile);
1653 return -1;
1654 }
1655 if (hashcmp(freq->sha1, freq->real_sha1)) {
1656 unlink_or_warn(freq->tmpfile);
1657 return -1;
1658 }
1659 freq->rename =
1660 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1661
1662 return freq->rename;
1663 }
1664
1665 void abort_http_object_request(struct http_object_request *freq)
1666 {
1667 unlink_or_warn(freq->tmpfile);
1668
1669 release_http_object_request(freq);
1670 }
1671
1672 void release_http_object_request(struct http_object_request *freq)
1673 {
1674 if (freq->localfile != -1) {
1675 close(freq->localfile);
1676 freq->localfile = -1;
1677 }
1678 if (freq->url != NULL) {
1679 free(freq->url);
1680 freq->url = NULL;
1681 }
1682 if (freq->slot != NULL) {
1683 freq->slot->callback_func = NULL;
1684 freq->slot->callback_data = NULL;
1685 release_active_slot(freq->slot);
1686 freq->slot = NULL;
1687 }
1688 }
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